Hammer



FIG. 1 is a perspective view of a hammer showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a front elevational view thereof.

The left side of the hammer is a mirror image of the right side. 

The ornamental design for a hammer, as shown and described. 